Abstract:
Introduction With the vigorous development of renewable energy, clean and efficient utilization of low-rank coal not only improves resource utilization and economic value but also has great social significance. Low-rank coals such as lignite and weathered coal are the main sources of coal-based humic acid, humic acid is widely used because of its weak acidity, redox, and physiological activity, however, direct extraction is difficult to achieve efficient extraction of humic acid in coal, which usually requires oxidation pretreatment to improve the yield of humic acid.
Method Firstly, the properties and applications of humic acid were introduced; then, the process, principle, and characteristics of traditional chemical oxidation were introduced, and the new low-rank coal electrochemical oxidation methods and advantages were summarized. Finally, the prospect of electro-chemical humic acid production from low-rank coal was prospected to provide a reference for the preparation of humic acid from low-rank coal.
Result Electrochemical oxidation method has the advantages of mild conditions, easy control of reaction, high yield, and reduction of environmental pollution. It is a relatively promising method for the preparation of humic acid.
Conclusion The efficient extraction of humic acid from low-rank coal by electrochemical oxidation driven by renewable power is one of the ways to achieve high value-added utilization of non-fuel in low-rank coal.
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